sparc, sparc64: use arch/sparc/include

The majority of this patch was created by the following script:

***
ASM=arch/sparc/include/asm
mkdir -p $ASM
git mv include/asm-sparc64/ftrace.h $ASM
git rm include/asm-sparc64/*
git mv include/asm-sparc/* $ASM
sed -ie 's/asm-sparc64/asm/g' $ASM/*
sed -ie 's/asm-sparc/asm/g' $ASM/*
***

The rest was an update of the top-level Makefile to use sparc
for header files when sparc64 is being build.
And a small fixlet to pick up the correct unistd.h from
sparc64 code.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

arch/sparc/include/asm/byteorder.h

@@ -0,0 +1,57 @@
+#ifndef _SPARC_BYTEORDER_H
+#define _SPARC_BYTEORDER_H
+
+#include <asm/types.h>
+#include <asm/asi.h>
+
+#ifdef __GNUC__
+
+#ifdef CONFIG_SPARC32
+#define __SWAB_64_THRU_32__
+#endif
+
+#ifdef CONFIG_SPARC64
+
+static inline __u16 ___arch__swab16p(const __u16 *addr)
+{
+	__u16 ret;
+
+	__asm__ __volatile__ ("lduha [%1] %2, %0"
+			      : "=r" (ret)
+			      : "r" (addr), "i" (ASI_PL));
+	return ret;
+}
+
+static inline __u32 ___arch__swab32p(const __u32 *addr)
+{
+	__u32 ret;
+
+	__asm__ __volatile__ ("lduwa [%1] %2, %0"
+			      : "=r" (ret)
+			      : "r" (addr), "i" (ASI_PL));
+	return ret;
+}
+
+static inline __u64 ___arch__swab64p(const __u64 *addr)
+{
+	__u64 ret;
+
+	__asm__ __volatile__ ("ldxa [%1] %2, %0"
+			      : "=r" (ret)
+			      : "r" (addr), "i" (ASI_PL));
+	return ret;
+}
+
+#define __arch__swab16p(x) ___arch__swab16p(x)
+#define __arch__swab32p(x) ___arch__swab32p(x)
+#define __arch__swab64p(x) ___arch__swab64p(x)
+
+#endif /* CONFIG_SPARC64 */
+
+#define __BYTEORDER_HAS_U64__
+
+#endif
+
+#include <linux/byteorder/big_endian.h>
+
+#endif /* _SPARC_BYTEORDER_H */